从源码角度入手实现RecyclerView的Item点击事件

 转载请注明出处:http://www.cnblogs.com/cnwutianhao/p/6758373.html 

 

 RecyclerView 作为 ListView 和 GridView 的替代产物,相信在Android界已广为流传。

 RecyclerView 本是不会有类似 ListView 的那种点击事件,但是知道和会用又是两种情况,跟随我一起从源码角度分析,RecyclerView 点击事件。

 首先看一下 Google 对 ListView 家族谱的介绍:

 可以看出 ListView 归根结底就是一个 View 。

 再来看一下 Google 对 OnItemClickListener 接口做的描述:

 源代码总结的很全面、详细。

 下面看一下 ListView 调用 onItemClick 点击事件。

listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        // TODO
    }
});

 其实不然,RecyclerView 也可以使用 onItemClick 点击事件。请往下看:

 示例图片(Material Design + Butter Knife + Snackbar):

 

 实现 RecyclerView 点击事件

 1.导入必要的库

 Material Design 时代的Android,少不了各类库的支持

 UI类库

compile 'com.android.support:appcompat-v7:25.3.1'
compile 'com.android.support:cardview-v7:25.3.1'
compile 'com.android.support:recyclerview-v7:25.3.1'
compile 'com.android.support:design:25.3.1'

 Butter Knife (都啥时代了,快放弃 findViewById 吧)

compile 'com.jakewharton:butterknife:8.5.1'
annotationProcessor 'com.jakewharton:butterknife-compiler:8.5.1'

 

 2.布局文件(分为 主界面 和 Item布局界面)

 主界面(RecyclerView)

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recycler_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:overScrollMode="never"
        android:scrollbars="none" />

</RelativeLayout>

 Item布局界面(CardView)

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="80dp"
    android:layout_margin="10dp"
    android:background="@drawable/recycler_item_selector"
    app:cardBackgroundColor="@color/colorPrimary"
    app:cardCornerRadius="10dp"
    app:cardElevation="10dp">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_margin="10dp"
        android:text="item"
        android:textColor="@android:color/white"
        android:textSize="24sp" />

</android.support.v7.widget.CardView>

 

 3.自定义 Adapter 类

public class DemoAdapter extends RecyclerView.Adapter<DemoAdapter.ViewHolder> {

    private onRecyclerViewItemClick mOnRvItemClick;

    private Context mContext;

    String[] strings;

    public DemoAdapter(Context ctx, String[] strings, onRecyclerViewItemClick onRvItemClick) {
        mContext = ctx;
        this.mOnRvItemClick = onRvItemClick;
        this.strings = strings;
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(mContext).inflate(R.layout.activity_main_item, parent, false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        holder.setData(position);
    }

    @Override
    public int getItemCount() {
        return 20;
    }


    public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
        @BindView(R.id.textView)
        TextView textView;

        public ViewHolder(View itemView) {
            super(itemView);
            ButterKnife.bind(this, itemView);
            itemView.setOnClickListener(this);
        }

        public void setData(int position) {
            textView.setText("第" + position + "行");
        }

        @Override
        public void onClick(View view) {
            if (mOnRvItemClick != null)
                mOnRvItemClick.onItemClick(view, getAdapterPosition());
        }
    }

    /**
     * item点击接口
     */
    public interface onRecyclerViewItemClick {
        void onItemClick(View v, int position);
    }

}

 

4.主类(实现 onItemClick 方法 + Butter Knife + Snackbar)

public class MainActivity extends AppCompatActivity {

    @BindView(R.id.recycler_view)
    RecyclerView mRecyclerView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);
        DemoAdapter myAdapter = new DemoAdapter(this, null, new DemoAdapter.onRecyclerViewItemClick() {
            @Override
            public void onItemClick(View v, int position) {
                Snackbar.make(v, "第" + position + "行", Snackbar.LENGTH_SHORT).show();
            }
        });
        mRecyclerView.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false));
        mRecyclerView.setAdapter(myAdapter);
    }

}

 示例Demo下载地址:RecyclerView的Item点击事件

 

关注我的新浪微博,请认准黄V认证,获取最新安卓开发资讯。
关注科技评论家,领略科技、创新、教育以及最大化人类智慧与想象力!

 

posted on 2017-04-25 01:19  Tyhoo_Wu  阅读(2971)  评论(0编辑  收藏  举报

导航